JP2658804B2 - Wastewater treatment equipment - Google Patents

Wastewater treatment equipment

Info

Publication number
JP2658804B2
JP2658804B2 JP5152358A JP15235893A JP2658804B2 JP 2658804 B2 JP2658804 B2 JP 2658804B2 JP 5152358 A JP5152358 A JP 5152358A JP 15235893 A JP15235893 A JP 15235893A JP 2658804 B2 JP2658804 B2 JP 2658804B2
Authority
JP
Japan
Prior art keywords
wastewater treatment
wastewater
liquid
treatment apparatus
volatile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP5152358A
Other languages
Japanese (ja)
Other versions
JPH078940A (en
Inventor
健二 佐藤
直彦 賀川
誓 丹下
俊一 大矢
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NITSUKI KK
Original Assignee
NITSUKI KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NITSUKI KK filed Critical NITSUKI KK
Priority to JP5152358A priority Critical patent/JP2658804B2/en
Publication of JPH078940A publication Critical patent/JPH078940A/en
Priority to US08/419,142 priority patent/US5676802A/en
Application granted granted Critical
Publication of JP2658804B2 publication Critical patent/JP2658804B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/14—Fractional distillation or use of a fractionation or rectification column
    • B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
    • B01D3/322—Reboiler specifications
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
    • B01D3/38—Steam distillation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/101—Sulfur compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、硫化水素やアンモニア
を含有する廃水をスチームストリッピングにより処理し
て、廃水からそれら有害物を除去する廃水処理装置の改
良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved wastewater treatment apparatus for treating wastewater containing hydrogen sulfide and ammonia by steam stripping to remove harmful substances from the wastewater.

【０００２】[0002]

【従来の技術】石油精製プラントの各種装置から、硫化
水素、アンモニア、シアンなど種々の有害物を含有する
廃水が出るので、通常これをスチームストリッピングに
より処理して無害化している。 この処理を行なう装置
の代表的なフローチャートは、図２にみるとおりであ
る。 図２において、符号（１）はストリッパー塔、
(２)はフィードドラム、(３）はフィードボトム熱交換
器、(４）はリボイラー、(８)は凝縮器の役割をする熱
交換器、(９）はレシーバーである。2. Description of the Related Art Wastewater containing various harmful substances such as hydrogen sulfide, ammonia, and cyan is generated from various apparatuses of a petroleum refining plant, and is usually rendered harmless by steam stripping. FIG. 2 shows a typical flowchart of an apparatus for performing this processing. In FIG. 2, reference numeral (1) denotes a stripper tower,
(2) is a feed drum, (3) is a feed bottom heat exchanger, (4) is a reboiler, (8) is a heat exchanger serving as a condenser, and (9) is a receiver.

【０００３】この種の廃水処理装置においては、ストリ
ッピングにより廃水から分離されたガスを冷却する熱交
換器（８）の腐食が著しいのが悩みのたねである。 従
来の装置では、ストリッパー塔の塔頂から出たガス（約
１００℃）を、多管式熱交換器または空冷フィン付管で
ある凝縮器で凝縮させて、温度を常温近く（３０〜４０
℃）に低下させる。 このとき、塔頂ガスはＨ2Ｓ＋Ｎ
Ｈ3がしばしば５０％に達する高濃度であるため、塔頂
部分、冷却器への配管および凝縮器にわたって強い腐食
が起る。[0003] In this type of wastewater treatment apparatus, it is a problem that the heat exchanger (8) for cooling the gas separated from the wastewater by stripping is significantly corroded. In the conventional apparatus, the gas (about 100 ° C.) discharged from the top of the stripper tower is condensed by a multi-tube heat exchanger or a condenser which is a tube with an air-cooled fin, and the temperature is reduced to near normal temperature (30 to 40).
° C). At this time, the top gas is H 2 S + N
Since H 3 is often a high concentration to reach 50%, the top portion, a strong corrosion occurs over piping and the condenser to the cooler.

【０００４】ひとつの対策として、ストリッパー塔
（１）の頂部に凝縮器を組み込んだ装置（スタブドイン
型のオーバーヘッドコンデンサー）が案出された。 こ
れによれば、配管がないからその部分の腐食の問題は解
消するが、通常はヘアピン型をしている冷却管の部分は
表面の腐食が著しく、抜本的な解決にはならない。As one measure, a device (a stubbed-in type overhead condenser) in which a condenser is incorporated at the top of the stripper column (1) has been devised. According to this, the problem of corrosion of the portion is eliminated because there is no piping, but the surface of the cooling tube portion, which is usually in the form of a hairpin, is remarkably corroded and cannot be a drastic solution.

【０００５】装置材料に耐食性の高いチタンを使用して
も、耐用年数は２〜３年にしかならず、補修のため運転
を停止しなければならないことがある。 そこで、より
長い耐用年数をもったスチームストリッピング装置の出
現が要望されていた。[0005] Even if titanium having high corrosion resistance is used as an apparatus material, the service life is only two to three years, and the operation may need to be stopped for repair. Therefore, the emergence of a steam stripping device having a longer service life has been demanded.

【０００６】[0006]

【発明が解決しようとする課題】本発明の主要な目的
は、上記の要望にこたえて、腐食が軽減された廃水処理
装置を提供し、プラントの耐用年数を１０年以上に延長
することにある。SUMMARY OF THE INVENTION It is a primary object of the present invention to provide a wastewater treatment apparatus with reduced corrosion in order to meet the above-mentioned demand, and to extend the service life of the plant to 10 years or more. .

【０００７】本発明の付加的な目的は、スチームストリ
ッピング装置を常用の比較的安価なステンレス鋼で構成
して、しかも腐食の問題が生じない廃水処理装置を提供
することにある。[0007] It is an additional object of the present invention to provide a wastewater treatment apparatus wherein the steam stripping apparatus is made of conventional and relatively inexpensive stainless steel and which does not cause corrosion problems.

【０００８】[0008]

【課題を解決するための手段】本発明の廃水処理装置
は、揮発性かつ腐食性の物質を含有する廃水をスチーム
ストリッピングにより処理して、廃水からその揮発性か
つ腐食性の物質を除去する廃水処理装置において、図１
に示すように、ストリッパー塔（１）内の廃水供給位置
より上方に液滞留部（５）、さらに塔頂に液分配器
（６）を設け、液滞留部から抜き出した液を液分配器に
戻して塔頂からスプレーするように配管し、この配管の
途中に液の冷却器（７）を備えたことを特徴とする。SUMMARY OF THE INVENTION A wastewater treatment apparatus of the present invention treats wastewater containing volatile and corrosive substances by steam stripping to remove the volatile and corrosive substances from the wastewater. In the wastewater treatment equipment, FIG.
As shown in (1), a liquid reservoir (5) is provided above the wastewater supply position in the stripper column (1), and a liquid distributor (6) is provided at the top of the column, and the liquid extracted from the liquid reservoir is supplied to the liquid distributor. It is characterized in that a pipe is returned and sprayed from the top of the tower, and a liquid cooler (7) is provided in the middle of the pipe.

【０００９】[0009]

【作用】従来のスチームストリッピング装置においては
いずれも、高濃度で揮発性かつ腐食性の物質と水分とが
共存するガスが冷却されて凝縮する、いわゆる初期凝縮
が冷却管の表面で起り、凝縮水中に高濃度で腐食性物質
が溶存する液が生成して、これが接触した部分が著しく
腐食されることにより、腐食問題が深刻になっていたこ
とを、発明者らは知った。In any of the conventional steam stripping apparatuses, a gas in which a high-concentration volatile and corrosive substance and moisture coexist is cooled and condensed, so-called initial condensation occurs on the surface of the cooling pipe and condenses. The inventors have found that a solution in which a corrosive substance is dissolved at a high concentration in water is generated, and a portion that comes into contact with the solution is significantly corroded, resulting in a serious corrosion problem.

【００１０】そこで本発明においては、ストリッパー塔
内部で循環する液により塔頂ガスを冷却して、この液中
で初期凝縮を起させることにより、腐食性物質の高濃度
の水溶液が金属製の装置材料表面に接触することを避け
た。 その結果、装置の腐食が顕著に減少したわけであ
る。Therefore, in the present invention, the top gas is cooled by the liquid circulating inside the stripper tower, and the initial condensation is caused in the liquid, so that a high-concentration aqueous solution of a corrosive substance is made into a metal apparatus. Avoid contact with material surface. As a result, corrosion of the device was significantly reduced.

【００１１】ストリッパー塔の塔上部において循環する
液は、硫化水素、アンモニアそのほかの有害物質が蓄積
してくるので、適宜の時間間隔で、または連続的に、一
部を抜き出して別の工程で処理する。The liquid circulating in the upper part of the stripper tower accumulates hydrogen sulfide, ammonia and other harmful substances. Therefore, at an appropriate time interval or continuously, a part is extracted and treated in another step. I do.

【００１２】[0012]

【発明の効果】本発明の装置を使用すれば、揮発性かつ
腐食性の有害な物質、代表的には硫化水素およびアンモ
ニア、を含有する廃水をスチームストリッピングにより
処理してこれら有害物質を廃水から除去する工程におい
て、装置の腐食に悩まされることなく、長期間、通常は
１０年以上、の耐用年数をもって装置を使用できる。According to the apparatus of the present invention, wastewater containing volatile and corrosive harmful substances, typically hydrogen sulfide and ammonia, is treated by steam stripping to remove these harmful substances. In the process of removing from the apparatus, the apparatus can be used for a long period of time, usually 10 years or more, without suffering from corrosion of the apparatus.

【００１３】装置の材料としてチタンを使用すれば、耐
食性は申し分なく、長期にわたって装置を使用できる。
ふつうはその必要がなく、ステンレス鋼、それも常用
の比較的安価なもので足り、建設費を低減することがで
きる。If titanium is used as the material of the device, the corrosion resistance is satisfactory and the device can be used for a long time.
Usually, this is not necessary, and stainless steel, which is also commonly used and relatively inexpensive, suffices to reduce construction costs.

【００１４】装置の腐食問題が実質上解消したので、運
転を停止してメンテナンスをする必要はなくなり、安定
した操業が実現する。 従ってこの装置は、石油精製プ
ラント、化学プラント、および廃棄物処理プラントに有
用である。Since the problem of corrosion of the apparatus has been substantially solved, there is no need to stop the operation and perform maintenance, and stable operation is realized. Thus, the device is useful in petroleum refineries, chemical plants, and waste treatment plants.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 本発明の廃水処理装置の構成を示すフローチ
ャートであるとともに、ストリッパー塔の構造を示す断
面図。FIG. 1 is a flowchart showing a configuration of a wastewater treatment apparatus of the present invention, and a cross-sectional view showing a structure of a stripper tower.

【図２】 従来の廃水処理装置の構成を示す、図１に対
応するフローチャート。FIG. 2 is a flowchart corresponding to FIG. 1, showing a configuration of a conventional wastewater treatment apparatus.

【符号の説明】[Explanation of symbols]

１ ストリッパー塔 ２ フィードドラム ３ フィードボトム熱交換器 ４ リボイラー ５ 液滞留部 ６ 液分配器 ７ 循環液冷却器 ８ 熱交換器（凝縮器） ９ レシーバー DESCRIPTION OF SYMBOLS 1 Stripper tower 2 Feed drum 3 Feed bottom heat exchanger 4 Reboiler 5 Liquid retention part 6 Liquid distributor 7 Circulating liquid cooler 8 Heat exchanger (condenser) 9 Receiver

───────────────────────────────────────────────────── フロントページの続き (72)発明者 大矢 俊一 神奈川県横浜市南区別所一丁目14番１号 日揮株式会社横浜事業所内 (56)参考文献 特開 昭49−98765（ＪＰ，Ａ) 特開 平５−50096（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shunichi Oya 1-14-1 Minami-bashiri-cho, Yokohama City, Kanagawa Prefecture JGC Corporation Yokohama Office (56) References JP-A-49-98765 (JP, A) Kaihei 5-50096 (JP, A)

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 揮発性かつ腐食性の物質を含有する廃水
をスチームストリッピングにより処理して廃水からその
揮発性かつ腐食性の物質を除去する廃水処理装置におい
て、ストリッパー塔内の廃水供給位置より上方に液滞留
部、さらに塔頂に液分配器を設け、液滞留部から抜き出
した液を液分配器に戻して塔頂からスプレーするように
配管し、この配管の途中に液の冷却器を備えたことを特
徴とする廃水処理装置。1. A wastewater treatment apparatus for treating wastewater containing a volatile and corrosive substance by steam stripping to remove the volatile and corrosive substance from the wastewater. A liquid storage section is provided above, and a liquid distributor is further provided at the top of the tower, and a pipe drawn out from the liquid storage section is returned to the liquid distributor and sprayed from the top of the pipe. A wastewater treatment device comprising: 【請求項２】 液の冷却器としてチタンまたはステンレ
ス鋼で製作した熱交換器を使用した請求項１の廃水処理
装置。2. The wastewater treatment apparatus according to claim 1, wherein a heat exchanger made of titanium or stainless steel is used as a liquid cooler. 【請求項３】 硫化水素および（または）アンモニアを
含有する廃水の処理に使用する請求項１の廃水処理装
置。3. The wastewater treatment apparatus according to claim 1, which is used for treating wastewater containing hydrogen sulfide and / or ammonia.
JP5152358A 1993-06-23 1993-06-23 Wastewater treatment equipment Expired - Fee Related JP2658804B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP5152358A JP2658804B2 (en) 1993-06-23 1993-06-23 Wastewater treatment equipment
US08/419,142 US5676802A (en) 1993-06-23 1995-04-10 Apparatus for treating waste water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5152358A JP2658804B2 (en) 1993-06-23 1993-06-23 Wastewater treatment equipment

Publications (2)

Publication Number Publication Date
JPH078940A JPH078940A (en) 1995-01-13
JP2658804B2 true JP2658804B2 (en) 1997-09-30

Family

ID=15538802

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5152358A Expired - Fee Related JP2658804B2 (en) 1993-06-23 1993-06-23 Wastewater treatment equipment

Country Status (2)

Country Link
US (1) US5676802A (en)
JP (1) JP2658804B2 (en)

Cited By (1)

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CN107497131A (en) * 2017-09-04 2017-12-22 合肥天翔环境工程有限公司 A kind of VOC gas recovery system
CN111760320B (en) * 2020-08-11 2021-12-17 中国石油化工股份有限公司 Method and device for slowing down corrosion of reflux system at tower top of condensate stripping tower

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Also Published As

Publication number Publication date
US5676802A (en) 1997-10-14
JPH078940A (en) 1995-01-13

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